function z (radius) {
    let nodes, random, strength = 1, iterations = 1;
    var constant;
    function force() {        
    }
    function initialize() {
    }
    force.initialize = function (_nodes, _random) {
        nodes = _nodes;
        random = _random;
        initialize();
    };
    force.iterations = function (_) {
        return arguments.length ? (iterations = +_, force) : iterations;
    };
    force.strength = function (_) {
        return arguments.length ? (strength = +_, force) : strength;
    };
    force.radius = function (_) {
        return arguments.length ? (radius = typeof _ === "function" ? _ : constant(+_), initialize(), force) : radius;
    };
    return force;
}
console.log (z(42))
